Various smaller fixes

• Added method Document.fullcopyPage to make full page copies within a PDF (not just copied references as Document.copyPage does).
• Changed methods Page.getPixmap, Document.getPagePixmap to now use alpha=False as default.
• Changed text extraction: the span dictionary now (again) contains its rectangle under the bbox key.
• Changed methods Document.movePage and Document.copyPage to use direct functions instead of wrapping Document.select - similar to Document.deletePage in v1.14.16.
• The GitHub repo no longer contains interface files generated by SWIG (fitz.py, fitz_wrap.c). This allows easier tracking of inter-version source differences which is needed by providers of various Linux platforms. The PyPI source distribution still has the previous structure which includes those generated files.
• Please remember: since version 1.14.16, we store wheel files on PyPI only.