*Title: Cronjob scripts for cleaning up old and internal(untouched) drafts

*Documentation:

There is a new cronjob called 'old_drafts_cleanup.php' which removes old
drafts from the system. If a version of a content object is created and
stored as a draft, the status of the version will be '0'. By default,
the cronjob script will remove status '0' drafts that have been in the
system for over 90 days. This lifetime duration is controlled by the
"DraftsDuration[]" configuration setting located in the "[VersionManagement]"
block of the 'settings/content.ini' file. The maximal number of drafts to
remove at a one call of the script is specified by the "DraftsCleanUpLimit"
setting located at the same place.

Similar settings have been also added for the 'internal_drafts_cleanup.php'
cronjob which removes status '5' drafts (also called "internal drafts" or
"untouched drafts" in terms of the admin interface). By default, this cronjob
script will remove internal drafts that have been in the system for over
24 hours (1 day). This is controlled by the "InternalDraftsDuration[]"
configuration setting, while the maximal number of internal drafts to remove
is specified by the "InternalDraftsCleanUpLimit" setting.

*Ini settings:

See section [VersionManagement] in the 'settings/content.ini' file:

[VersionManagement]
........

# Number of days, hours, minutes and seconds before a draft is considered old and can be removed
# 90 days by default
DraftsDuration[]
DraftsDuration[days]=90
DraftsDuration[hours]=0                              
DraftsDuration[minutes]=0                            
DraftsDuration[seconds]=0                            
# Clean-up limit per one run of the 'old_drafts_cleanup.php' cronjob script
DraftsCleanUpLimit=100                               
                                                   
# Number of days, hours, minutes and seconds before an internal draft is considered old and can be removed
# 1 day by default
InternalDraftsDuration[]
InternalDraftsDuration[days]=1
InternalDraftsDuration[hours]=0
InternalDraftsDuration[minutes]=0
InternalDraftsDuration[seconds]=0
# Clean-up limit per one run of the 'internal_drafts_cleanup.php' cronjob script
InternalDraftsCleanUpLimit=100