[sr-dev] erlang module pvs

Hello,

I noticed that erlang module is exporting couple of config variable classes (pseudo-variables) with various names. I would suggest to prefix them with 'erl' or something similar to know they are related and specific to erlang module. Many modules do so already (e.g., tm uses $T...). You used some generic names that could be confusing at some point with other components (e.g., 'tuple' is also used a lot in presence, 'pid' is something common any process and kamailio has also some variable related to it).

Another note: documenting PVs in README is ok, but then need to be also documented in the wiki cookbook:

- http://www.kamailio.org/wiki/cookbooks/devel/pseudovariables

Cheers, Daniel