hdf5_ep

[svn-r21531] Merge of 21501 and 21502 from trunk:

Note that this differs slightly from the trunk code since the VFL API won't be
changed until 1.10.  In the 1.8 branch, the term() function is public and this
required some #defines for the Windows VFD.

21501:

- Propagated Windows VFD tweaks to SEC2 and log VFDs.

- Created typedefs and #defines to make POSIX I/O type-safe on Windows and true POSIX platforms.

- Added pre-checks and removed post-checks for POSIX I/O sizes.  When the number of bytes to be sent exceeds the maximum return value, the operation is split into smaller subsets.

- General code tidying and cleanup.


21502:

- Removed Windows VFD code.  H5Pset_fapl_windows() actually sets the SEC2 driver, though it will still report H5FD_WINDOWS.