WB4BXO: Possibly fixed direct-only digipeating

Since I currently only use aprx as an iGate and fill in digi
(WB4BXO-3) in conjunction with my main digi (WB4BXO-7) I was not
aware of it always only repeating direct heard packets until I
heard about it from kg4pid. I fixed what seemed to me to be the
cause of that problem in digipeater.c where it appears to be
stopping its via search on the first "starred" digi instead of
the first "un-starred" digi.
WB4BXO: Third-party and "d" filter processing

Third party filtering
    I had made a fix for the third party packet filtering to SVN
    revision 593 but found that Matti had already fixed it in SVN
    but had not published it. Matti fixed it by rebuilding the pbuf
    with the source and destination calls. I had fixed it by moving
    the filter processing to when the original pbuf was still intact.
    I went with what Matti had done since it is after all his code.
    However I did add to the new filter pbuf the via calls so that
    filtering could be done against them as well. Like blocking
    anything with qAR in its via fields (more on this later).

"d" filter processing
    Once making the previous change and putting a filter in to
    block anything that had qAR (among others) in the via fields,
    I realized that the "d" filter did not handle negations (-d).
    I made the change to return the proper code when negated and
    then found that the processing did not stop at the end of the via
    fields, so I added a test for the ":" to end an individual field
    as well as to terminate further processing. Without this it was
    trying to process the data section after the via fields as if it
    were more via digis. Also upon getting this working, I took out
    a bit of hard code that looked for qA? codes since at present it
    only looked for qAX, which was already filtered elsewhere. I did
    this with the intention that any qA? codes could be added to the
    -d filter list, thus allowing for the rare case in which someone
    may have a valid need to digi them.
Added .gitignore file

Ignore specific ./configure and make results, as well as
all *.o and *.d object and dependency files