tests compare against git hash, eliminate cached .h5

This updates the test infrastructure to store a git hash of the reference code, instead of generated .h5 files. The test infrastructure creates a cache of the reference .h5 files from the specified git hash if it doesn't already exist, and then compares against that cache.

This gets rid of the need for git-lfs and the cached .h5 files, requiring instead the code is checked out from git.

gwinc/test/__main__.py

@@ -14,7 +14,7 @@ from collections.abc import Mapping
 from PyPDF2 import PdfFileReader, PdfFileWriter
 
 from .. import IFOS, load_budget
-from ..io import load_hdf5, save_hdf5
+from ..io import load_hdf5
 
 try:
     import inspiral_range
@@ -27,7 +27,6 @@ logging.basicConfig(
     level=os.getenv('LOG_LEVEL', logging.INFO))
 
 
-FREQ = np.logspace(np.log10(5), np.log10(6000), 3000)
 TOLERANCE = 1e-6
 CACHE_LIMIT = 5