use -Wmissing-prototypes to help find dead code

(by forcing us to declare functions static, allowing gcc to tell us
"warning: foo defined by not used")

fix

redo razor_set_update to only rebuild the set once

messy, and with too much duplicated code...

fix one of the tests to match the probably mistaken python version, and
add two more comments pointing out oddities in the python tests

Merge branch 'master' of git+ssh://people.freedesktop.org/~danw/razor

Conflicts:

razor.c

make razor_set_update not loop forever on unsatisfiable dependencies

this is mostly a dead-end, as to get the next test working i need to
rewrite the code as suggested in the comment above razor_set_revalidate

redo razor_set_remove() to only do a single merge

Add support for removing packages

Should be redone to avoid rebuilding the set multiple times

First two tests pass now

fix rebuild_property_package_lists to put the lists in the right pool

(likewise rebuild_file_package_lists, which was copied from it)

Merge file lists when updating

Currently a bit of a mess due to repeated rewriting. To be cleaned up
after we decide whether or not to keep the current file layout