Update to 0.4.1

- Web searches: Improved support for user-triggered cancelling
- SpringerLink search: GUI changes, using api.springer.com for search
- PubMed: Limiting search requests per time
- ACM Portal: Retrieving "month", fixing HTTP header
- JSTOR: fixing HTTP header
- Google Scholar: Updates to compensate for changes in Google's web layout;
  handling redirects
- Science Direct: Updates to compensate for changes in Science Direct's web
  layout; handling redirects
- arXiv: Trying to extract bibliographic information from journal strings
- BibSonomy: Specifying number of hits to find
- Web search uses KDE's proxy settings
- Using KDE subsystem to open external files (e.g. PDF files)
- Adding preview for images (in addition to PDF or HTML files); handling
  references to arXiv
- Squeezing long file names in user interface
- Handling quit actions more gracefully
- Improving interface to external programs such as pdflatex
- More robust XSL transformations
- BibTeX import: guessing encoding information left by JabRef, more
  informative debug output, improved handling of multiple fields with same
  name
- Reference preview: supporting dark color schemes
- Fixing sorting in value list
- Fixes in setting color tag to entries
- Fixes in name formatting
- Keeping user interface read-only for read-only use cases
- Numerous bug fixes, closing memory leaks, speed improvements
- Adding testing application for web searches
- Fixes in duplicate merging code: remove fields user doesn't want to keep

(markd)