Thorough automated tests

[vampirefrog]

File stream:

• Open a file write only, write a string, close, open read only, read, check content, close
• Open a file write only in gzip mode, write a string, close, open read only with auto gzip mode, read, check content, close
• Try memory mapping a file in non gzip mode
• Try memory mapping a file in gzip mode

Memory stream

• Test gzip modes

Zip file stream

• read a non gzipped file and check contents
• read a gzipped file and check contents
• test memory mapping for a non gzipped and for a gzipped file

For all tests:

• write a uint8, uint16, uint32 and read them back

[vampirefrog]

Figure out more tests