Fixed zathura going to first page when toggling index mode after using the inputbar

See merge request !40

Implement copying the link target into the system clipboard.

Bookmark command line argument

See merge request !38

enable OSX dock integration

See merge request !34

0.4.7

Rectangles might be a little off, but is a lot faster if processing 100s
of rectangles.

This commit fixes attempt to set INFINITY zoom value when opening
document for first time with "adjust-open width" option.

In this case function zathura_document_get_document_size returns 0 width
which leads to incorrect zoom calculation.

Version 0.4.6