add support for binary protocol for pcpatch

[cyrilleberger]

This is an updated version of #85, with a test and update.

Two comments

• the test requires /tmp/pgpointcloud_pa_test_file to be writable
• the update to pg_type to install the pcpatch_send/pcpatch_recv functions is run even on new installation, which is unneeded (but harmless, as far as I know)

No idea on how to do differently and if it is a big problem.

[cyrilleberger]

I was wondering, is anything else needed?

[cyrilleberger]

Not entirely sure why the change I made would cause the errors, but if there is ever any interest in merging I could have a look.

[cyrilleberger]

Formatting fixed, and updated to the latest master. "make check" is still passing.