* adding H5Z-ZFP; updating zfp to use choice variant for bit stream word size
* fixing homepage url
* removed fortran error message...just build fortran if can, otherwise ignore
* adding 0.5.1 and variant for uint8 bit stream word type
* Revisions as per davydden
* fixing style (flake8) issues
* - switched to derive from MakefilePackage
- fixed typo in variant check
- Confirmed installs correctly with bswtuint8 variant
* added build method; changed zfp_incdir to incdir
