
Add checking of local header of file, Now just uses the info provided
in directory and the (empirically studied) fact that extra field
has 2 bytes more info in local header than in directory -- this may
not be true in all cases.  **DONE** **DONE** **DONE** **DONE** **DONE**

Check the CRC value at the end of read...

Add more error codes.

Do more test. Currently use only with tested "friendly" archives.
inflate interface code needs most testing.

More documentation.
