Move db_string building into the pg instantiation function

Add application_name to the db_string
Doing it the smart way causes Doxygen errors
Fix compilation of rlm_eap

Mark rlm_eap_tnc connection_string const to cater to FR_CONF_OFFSET
invocation. This fixes the build of rlm_eap module.
Use signed int to represent epoch in rlm_cache
Cast interval values to ints before use, so we don't get sign issues with time_t. Fixes #659
Typo
One last sign fix for rlm_securid
Don't delay proxy replies when there was a timeout
Call rad_postauth() and send the packet from proxy_no_reply.  Closes #657
Tighter range constraint on INTEGER types
Use the same format as other applications
Update ChangeLog
Don't reconnect on QUERY CANCELED
Impose a hard limit on the number of reconnection attempts for rlm_sql and rlm_ldap
This should never happen
rm unused goto
Add asserts to radlog functions
Should be error message
Add instance to application name
Fix cbtls now we don't check for request in RDEBUG macros