Add localversion to the VersionDescription record and populate it
during version string parsing.
This change also modifies the version string syntax, removing the
deprecated dash (-) between beta|dev|rc and the commmit count; those
must now be separated by a period.
The test version strings were updated accordingly along with the
baseline.
* "bro_is_terminating" is now "zeek_is_terminating"
* "bro_version" is now "zeek_version"
The old function names still exist for now, but are deprecated.
This also installs symlinks from "zeek" and "bro-config" to a wrapper
script that prints a deprecation warning.
The btests pass, but this is still WIP. broctl renaming is still
missing.
#239
