## function compress_man_pages

#### Main purpose

1. Decompress all man and info pages found in the package.
2. Correct permissions.
3. Re-compress them uniformly.

#### Notes

All man-pages and info pages are first uncompressed if needed. Then the permissions of the uncompressed files are corrected and they are re-compressed using the MAN_COMPRESS command. By default they are compressed with gzip, but you can use MAN_COMPRESS=bzip2.
Some sources install pre-compressed man-pages and they may not be using the same compression or have proper file permissions when uncompressed. This is why everything is unpacked first and then recompressed.