V1.8.0 is deployed

New V1.8.0 is available as release candidate with some major evolutions

Reminders and alerts
- definition of default delay for each type and urgency of ticket
- automatic update of due date for tickets depending on defaut delay
- definition of indicators, base either on due dates or on work or on cost
- definition on warning and alert level for each indicator definition
- automatic generation of alerts when warning or alert level is reached

LDAP connectivity
- Thanks to "Jean Noel" who developed this interface

Choose unit as days or hours for Real work imputation and / or work follow up

Translation to spanish
- Thanks to "Death user"

Administration screen
- closing and deleting emails
- closing and deleting alerts
- sending some alert to one or all users

Global parameter screen
- definition of work times
- definition of work unit
- check version or not
.. other parameters should later migrate from parameter file to this screen

User interface improvements
- after saving en element, reposition on current element in list and restore existing sort order
- planning scrolling
- show ovedrdue items on today screen (elements with alerts)
- display mime type of attached files as icons (instead of text)

Automatic check of version upon last released version

...and some bug fixing : #400, #417, #418, #423, #424, #425, #426, #428, #429, #430, #436

And now V1.8.1 corrects some bug...

V1.8.2 becomes new stable release.

V1.8.3 is deployed, including some fixing about Gantt visibility fro Project Leader profile