Fixing several minor issues

This fixes #412, #411 and #407 and also inroduces some minor usability enhancements.

Introducing "fitz as a module"

Various fixes

Fixing #394

fixes #394

Fix #390

1.16.6

upload v1.16.6

Fix #381 part 2

On rare occasions, page rendering and text extraction caused interpreter segmentation faults.
When fonts on a page (illegally) were meeting all of the following conditions:

1. a non-UTF8 encodable name
2. not embedded in the PDF
3. using Identity-H / Identity-V ancoding

Then MuPDF reacted with appropriate warning messages (which are intercepted by PyMuPDF).
In prior versions, PyMuPDF did not expect non-UTF8 messages and used a too "optimistic" char to unicode conversion method, which brought down the interpreter.
This has changed in the new version.

Fixing #381

also new generators for document pages and page annotations, widget and links.

Fixes #369

• significant performance improvements for dict / rawdict text extraction
• Page.getText() now support text extraction for "blocks" and "words"

Fixes #362

1.16.2

fixing #362

Fixing issues #352, #353 and #354

1.16.1

publish v1.16.1

Full PDF Password Protection

1.16.0

upload version 1.16.0