List current topups and usages

Use built in DateTime methods
Added SMAdminDepletedOn functionality and columns

Remove 'value' element if it's not needed
Remove unnecessary next and setting excess usage to zero

We don't want to look for previous topups, this causes smadmin to to calculate usage when it doesn't need to

Results for admin interface are now in line with user interface

Indexed PeriodKey column

Cleaned up data and uptime calculation

Check if user is disabled

Pass datetime as text to DBSelect
Selected topups ValidFrom must equal the first of the current month

* If we have somehow gotten duplicate sessions and we roll over to midnight, we must not rollunder to -4G and record 4G minus the difference in usage as the new session usage. Lets record 0 instead.

* Improved logging

* Modified NAS-Port-Id to use a blank default if not defined (in the case of vpn's)

Use window name on all removes

 webgui/ajax.php                                 |    8 +-
 webgui/include/ajax/functions/AdminUserLogs.php |   80 ++++++++----------------
 webgui/include/ajax/functions/WiSPUserLogs.php  |   80 ++++++++----------------
 webgui/js/app/windows/AdminUserLogs.js          |   11 ++-
 webgui/js/app/windows/WiSPUserLogs.js           |   11 ++-
 webui/user/index.php                            |   68 ++++++++++----------
 webui/user/logs.php                             |   48 ++++++--------
 7 files changed, 131 insertions(+), 175 deletions(-)

 accounting/mod_accounting_sql.pm |   97 ++++++++++++++++++++++++++-------------
 system/mod_config_sql_topups.pm  |   36 +++++++++-----
 2 files changed, 89 insertions(+), 44 deletions(-)