* add a test (currently fails, of course)
* backup, not really working
* Fixes#1240
* a bit more parameter tweaking to get some more structures to embed
* passes all tests, but is still not 100 percent there
* generalize _centerInVolume for possible future use
* better testing of tetrahedral centers
update tests
* only test ring atoms
* handle 4-coordinate n too
* add a volume check; not all tests pass
* turn off debug printing
* rearrange the order of tests.
if this is not done, we get a seg fault when the github55 test runs.
the whole thing needs to be run under valgrind to track this down
* clear up a memory leak
* a bit more documentation
add a constant for one of the threshold values
* get more permissive on the energy tests.
Only do the extra tetrahedral tests for atoms in at least two rings.
* add a DEBUG_EMBEDDING option to make tracking down failures easier
* enable better debugging when the flag is set
* remove a FIX
* remove some debug printing from the tests
This covers at least the specific instances from the bug report.
Still need to figure out a general way to identify these automatically
to make sure all are fixed.
