comp: assorted bugs

Created an attachment (id=5993)
correcting some bugs in cmdutils/comp

Bugs in order:
1) Memory leak,
lines 63, 64 buffers Line1, Line2 are not freed.
2) Access violation bug when comparing files with size > STRBUF=1024 bytes.
line 169 - Line1, Line2 are incremented, and in GetLine - write outside
these buffers.
3) Incorrect algorithm of comparing - lines 158-171.
One of files can have more lines than another or more
chars on line than another but it says: Files compare OK.

I've attached patch, that corrects all these bugs.
Also implemented options /A /L, that were not supported.