Various changes

- Removing admin servlet (from web.xml for now), redundant with most functionality given to designer

+ It's possible to retrieve the current rights set on a node
  . /nodes/node/{uuid}/rights
+ Also, change rights (with admin rights) and a possibility to reset rights to the original state
  . /rights

* As admin, can filter the portfolio list as a specific user
  . parameter named 'userId'
* Moving a getConnection as helper.
  . Mostly there when you deploy on a hosted server that doesn't use connection pooling
* Some properties in pom.xml to facilitate version update
* Changing portfolio_group table, it's for future macro command server side
* Fix a superflous commit() when deleting a portfolio.

Misc:
* A bunch of name change to accomodate Oracle
  . PS: All Oracle work are courtesy of Thi Lan Anh DINH
* A few deprecated notice

LTI:
* Some LTI change, during testing, couldn't get either username, email. So we fall back on the contextid (LTI library, someday)
* LTI load files in {webapps}/{backend}_config now, instead of /opt/tomcat/{backend}
Vaguely initial work on OSP import via LTI:

+ A good copy/paste work
  . Notable POI start at line 302