Add PQBinReader for PicoQuant .bin files
Modfiy readers.txt to include PQBinReader
Correct HEADER_SIZE and add isThisType check.
Cosmetic changes as requested by rleigh.
Correct Reader in comment.
Remove unnecessary declaration of rowBuf.
Remove extra setting of m.littleendian.
Remove extra call to in.order.
Store pixelResolution as PixelsPhysicalSize
Untested changes to limit memory useage.
Add a size threshold to PQBinReader beyond which the data is not pre-loaded to obviate future memory issues. NB  loading is 4-5 times slower.
Add a similar size limit to SDTreader to obviate memory issues.
Set preLoad on closing.
Lower threshold to test both code paths.
Analyze: set littleEndian flag correctly

Fixes #12471.
Volocity: flag most files as being pixels files

This is the second part of the fix for #12485.  This should speed up
import time and assist in preventing MemoryLimitExceptions for large
Volocity filesets.
Merge pull request #1288 from melissalinkert/rebased/dev_5_0/analyze-endian

Analyze: set littleEndian flag correctly (rebased onto dev_5_0)
Merge pull request #1289 from melissalinkert/rebased/dev_5_0/volocity-companion-files

Volocity: flag most files as being pixels files (rebased onto dev_5_0)
Merge pull request #1287 from sbesson/rebased/dev_5_0/develop-PQBin

Add reader for PicoQuant .bin files. (rebased onto dev_5_0)