[Users] Migration to pseudo-variables completed

Hi folks, All module (acc,avpops,tm,xlog) that were using pseudo-variables like support are finally migrated to a common pseudo-variable core (located in OpenSER core). Advantages: consistency across current and future modules (only one definition scheme) gets red of code duplicity (easy to maintain and to fix) scalability - new pseudo-variables will be automatically seen from all modules without any additional changes I know that this migration broke a lot of compatibilities and will force user to re-acustome the new pseudo-variables notacion, but this was a necessary step. All the README/online-docs were update in order to give as much help as possible to users to adapt. For a list with supported pseudo-variables see http://www.openser.org/docs/pseudo-variables.html. If you have ideas for new useful variables to be added, let us know. regards, bogdan