[PATCH] Split protos.h into component-specific header files

Hi all,
  the attached patch is the first part (of what will be 2, judging
from the reduced side of protos.h) of my current refactoring effort
aiming at splitting protos.h into more easily-manageable chunks.

With this patch, the affected prototypes are moved close to their
respective implementation file (e.g. prototypes for functions defined
in ftp.cc are moved to the ftp.h file, creating it if it doesn't
already exist). For the affected prototypes, linkage is also changed
from c to c++. Include clauses and Makefile.am are adjusted
accordingly.

This patch has been build-tested (eCAP included), and
farm-build-tested. It succeeds to the extent where trunk succeds.
As there are no functional changes, I don't expect it to bring any
functional problems.

I'd like to commit to trunk, and to get some feedback before spending
more time on this.

Thanks

-- 
    /kinkie