Added base64 encode and decode functions
Added library check for libmath and changed dissectors to call new base64 decoding module. Will remove old from ec_strings.c later
Fixed parameter to double pointer
Adding M_LIB to main library variable. Removing unused variables
Removing unused variable i
Removed unused variables
REmoving compilation warning and setting buffer to \0 before decoding is done. This avoids trash at the end of the buffer
Merge pull request #504 from eaescob/b64-util

Added base64 encode and decode functions