permit at-sign in variable names

closes: https://github.com/rsyslog/rsyslog/issues/110
GCC complained about implicit declaration of gettimeofday.
Merge branch 'v8-stable-at-in-varname' into v8-stable

Conflicts:
	ChangeLog
Omudpspoof: fix incorrect source ports, caused by wrong byte order.
Omudpspoof: Minor cleanup of compiler warnings.
maintain ChangeLog
bugfix: imfile: if a state file for a different file name was set,

that different file (name) was monitored instead of the configured
one. Now, the state file is deleted and the correct file monitored.

closes: https://github.com/rsyslog/rsyslog/issues/103
Merge branch 'v7-stable' into v8-stable
nit: fix copyright year
maintain ChangeLog
Merge branch 'v8-stable'