Eliminates gcc warnings due to -Wunsuffixed-float-constants.
- Adds 'F' suffixes for most float constants.
- A few constants MUST be of type double. These now receive the long
double L suffix and are then cast to double. I do this via a new
H5_DOUBLE() macro which was added to H5private.h.
- Additionally, some 1.8-specific float suffixes were added.
Fixes: HDFFV-9148
Tested on: h5committest
Merge changes that correspond to the 64-bit ID changes (without the actual
switch to 64-bit IDs) to the 1.8 release branch. (Plus a few minor cleanups
and alignments with the trunk that aren't on the branch)
Tested on:
Mac OSX/64 10.9.4 (amazon) w/C++ & FORTRAN
(h5committested on branch already for a week)
