doc: Update loaders, add TIFF.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
doc: Remove '' from emphasized words, fixes.

* NULL, stderr, stdout... are now emphasized by default

* A few fixes

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
doc: Update compilation instructions

* Add links to libraries

* Add packages section

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
loaders: zip: Add flag defs.

Add flags definitions and print them to debug output.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
loaders: zip: Partial support for stream zip

Some zip files does not have crc, compressed size and uncompressed size
in zip local header but in data descriptor (which is located after the
data).

This commit modifies the decompression rutines to cope with unknown
buffer size (the buffer is reallocated on the fly).

Seeking in the ZIP does not work yet.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>