Fixes #5 (Uniform splitting of full square matrices)
document the hmatrix specification inference
ignoring project and temporary files
simplify matrix initialization and make use of hmatrix_inferspec for
determining the number of values to compute
make the uniform splitting feature (issue #5) depend on the definition
of USE_UNIFORM_SPLITTING and disable it for the time being
Merge pull request #11 from rieck/uniform_split

Uniform split as feature. Thanks.