refactoring - split parser as a separate project

code cleanup (split) autotools fiddling (relicensing) (fork as a new project, probably coordinate with @ondrej)

The rest is common with #3 (closed)

Status changed to closed

mentioned in issue #157 (closed)

mentioned in issue #211 (closed)

mentioned in issue #217 (closed)

mentioned in issue #359 (closed)

mentioned in issue #428 (closed)

mentioned in commit ff652f61

mentioned in commit bf70961c

mentioned in commit 7e306eb0

mentioned in commit 2b46a4b6

mentioned in issue #871 (closed)

mentioned in issue #922 (closed)