rlog: fix parsing of multiple file revisions
The rlog parser was only fetching a single file revision because some lines of code had the wrong indentation. These lines were supposed to be part of a loop body but were only executed once.
Also rename a function which had a misleading name and docstring. This function does in fact process the entire RCS revision history of a given file, as opposed to just one entry of RCS revision history.
Found while testing ingestion of the GNU dino repository from cvs.savannah.gnu.org/sources/dino
Migrated from D6560 (view on Phabricator)