infix

Fixes include:
* very small (less than 1pt) characters written in type 3 fonts are now ignored for the purposes of text editing
* improved arithmetic accuracy when saving tiny characters and their matrices.
* improved paragraph formation with respect to left indents and blank lines.
* resolved intermittent crash when using drag'n drop to open a document
* Update issue when moving tabstops in multiple paragraphs
* inter-character spacing issue could affect some fully-justified text when saved.
* stopped full-justify on lines ending with a line-break.