class TDataSetManager: public TObject

 Main constructor

 Destructor

 Parse the opts string and set the init bits accordingly
 Available options:
    Cq:               set kCheckQuota
    Ar:               set kAllowRegister
    Av:               set kAllowVerify
    As:               set kAllowStaging
    Sb:               set kIsSandbox
 The opts string may also contain additional unrelated info: in such a case
 the field delimited by the prefix "opt:" is analyzed, e.g. if opts is
 "/tmp/dataset  opt:Cq:-Ar: root://lxb6046.cern.ch" only the substring
 "Cq:-Ar:" will be parsed .

 Read group config file 'cf'.
 If cf == 0 re-read, if changed, the file pointed by fGroupConfigFile .

 expects the following directives:
 Group definition:
   group <groupname> <user>+
 disk quota
   property <groupname> diskquota <quota in GB>
 average filesize (to be used when the file size is not available)
   averagefilesize <average size>{G,g,M,m,K,k}

 Static utility function to gt the number of bytes from a string
 representation in the form "<digit><sfx>" with <sfx> = {"", "k", "M", "G",
 "T", "P"} (case insensitive).
 Returns -1 if the format is wrong.

 Utility function used in various methods for user dataset upload.

 Removes the indicated dataset

 Checks if the indicated dataset exits

 Returns all datasets for the <group> and <user> specified by <uri>.
 If <user> is 0, it returns all datasets for the given <group>.
 If <group> is 0, it returns all datasets.
 The returned TMap contains:
    <group> --> <map of users> --> <map of datasets> --> <dataset> (TFileCollection)

 The unsigned int 'option' is forwarded to GetDataSet and BrowseDataSet.
 Available options (to be .or.ed):
    kShowDefault    a default selection is shown that include the ones from
                    the current user, the ones from the group and the common ones
    kPrint          print the dataset content
    kQuotaUpdate    update quotas
    kExport         use export naming

 NB1: options "kPrint", "kQuoatUpdate" and "kExport" are mutually exclusive
 NB2: for options "kPrint" and "kQuoatUpdate" return is null.

 Scans the dataset indicated by <uri> and returns the number of missing files.
 Returns -1 if any failure occurs.
 For more details, see documentation of
 ScanDataSet(TFileCollection *dataset, const char *option)

 Gets quota information from this dataset

 Display quota information

 Prints the quota

 Log info to the monitoring server

 Returns the used space of that group

 returns the quota a group is allowed to have

 updates the used space maps

 Register a dataset, perfoming quota checkings, if needed.
 Returns 0 on success, -1 on failure

 Creates URI for the dataset manger in the form '[[/dsGroup/]dsUser/]dsName[#dsObjPath]',
 The optional dsObjPath can be in the form [subdir/]objname]'.

 Parses a (relative) URI that describes a DataSet on the cluster.
 The input 'uri' should be in the form '[[/group/]user/]dsname[#[subdir/]objname]',
  where 'objname' is the name of the object (e.g. the tree name) and the 'subdir'
 is the directory in the file wher it should be looked for.
 After resolving against a base URI consisting of proof://masterhost/group/user
 - meaning masterhost, group and user of the current session -
 the path is checked to contain exactly three elements separated by '/':
 group/user/dsname
 If wildcards, '*' is allowed in group and user and dsname is allowed to be empty.
 If onlyCurrent, only group and user of current session are allowed.
 Only non-null parameters are filled by this function.
 Returns kTRUE in case of success.

 Partition dataset 'ds' accordingly to the servers.
 The returned TMap contains:
                <server> --> <subdataset> (TFileCollection)
 where <subdataset> is the subset of 'ds' on <server>
 The partitioning is done using all the URLs in the TFileInfo's, so the
 resulting datasets are not mutually exclusive.
 The string 'exclude' contains a comma-separated list of servers to exclude
 from the map.

 Formatted printout of the content of TFileCollection 'fc'.
 Options in the form
           popt = u * 10 + f
     f    0 => header only, 1 => header + files
   when printing files
     u    0 => print file name only, 1 => print full URL

 Prints formatted information about the dataset 'uri'.
 The type and format of output is driven by 'opt':

   1. opt = "server:srv1[,srv2[,srv3[,...]]]"
            Print info about the subsets of 'uri' on servers srv1, srv2, ...
   2. opt = "servers[:exclude:srv1[,srv2[,srv3[,...]]]]"
            Print info about the subsets of 'uri' on all servers, except
            the ones in the exclude list srv1, srv2, ...
   3. opt = <any>
            Print info about all datasets matching 'uri'

   If 'opt' contains 'full:' the list of files in the datasets are also printed.
   In case 3. this is enabled only if 'uri' matches a single dataset.