fix issues with writing/reading

[joachimmetz]

• [x] fix https://github.com/libyal/libewf/issues/8 - added test coverage
• [x] fix https://github.com/libyal/libewf/issues/22 - handling split images
  • determine why chunks are seen as corrupt, also for EWF version 1
• [x] update man pages https://github.com/libyal/libewf/issues/27
• [x] fix https://github.com/libyal/libewf/issues/29
  • fixed unmanaged "corrupted" chunk data
• [x] fix last chunk write issue in split images
• [x] determine why read falls back to table2
• [x] improve handling missing chunks list
• [x] restrict resources used by multi-threaded approach
• [x] test and fix issues with new read/write chunk API
• [x] look into report of ewfverify -l not logging anything?
• [x] look into https://github.com/libyal/libewf/issues/35
• [x] look into https://github.com/libyal/libewf/issues/93
• [x] look into slow write chunk for version 2 format
• [x] complete chunk group size limitation

[joachimmetz]

ewfverify -l test.log floppy-encase5.04a-nohash.E01 
ewfverify 20160410

Verify started at: Apr 12, 2016 20:52:43
This could take a while.

Verify completed at: Apr 12, 2016 20:52:43

Read: 1.4 MiB (1474560 bytes) in 0 second(s)

MD5 hash stored in file:        N/A
MD5 hash calculated over data:      ae1ce8f5ac079d3ee93f97fe3792bda3

ewfverify: SUCCESS

cat test.log 
MD5 hash stored in file:        N/A
MD5 hash calculated over data:      ae1ce8f5ac079d3ee93f97fe3792bda3