Fix minor warning for clang (return false instead of null pointer)
Merge pull request #23 from fpsunflower/master

Fix minor compilation warning in PRT reader
Compile fix for mac os x (unsigned int instead of uint)
cmake: Allow users to specify CMAKE_INSTALL_PREFIX

Check whether CMAKE_INSTALL_PREFIX is defined before overwriting
its value.  This allows users to specify an alternate install prefix
during the `cmake` invocation.

Signed-off-by: David Aguilar <davvid@gmail.com>
cmake: Do not hard-code the path to doxygen

Use ${DOXYGEN_EXECUTRABLE} instead of hard-coding /usr/bin/doxygen.

Signed-off-by: David Aguilar <davvid@gmail.com>
cmake: Allow out-of-tree builds

We were referring to a build directory that does not exist
when building out-of-tree.

For example:

	mkdir build
	cd build
	cmake ..
	make
	make DESTDIR=$PWD/DESTDIR install

The `install` step will fail because build/src/py/partio.py
does not exist.  Remove the src/ subdirectory in the path so
that the file beneath build/ is found.

Signed-off-by: David Aguilar <davvid@gmail.com>
Merge pull request #27 from davvid/cmake

CMake enhancements
Work in progress new BGEO in Houdini 11+ binary format

You can run jsontest which will dump a testdump.bgeo in old format
in the current directory i.e. if you have a houdini11+ binary json
with points called foo.bgeo you should be able to do

jsontest foo.bgeo

and you will get

testdump.bgeo  in your curr dir