Changed version string to 0.9.98 consistently in the code

0.9.98 Release Candidate 1

- Folderbrowser async load
- New folderbrowser up and home buttons
- Fix error loading / saving to remote filesystems
- Fix error converting colors in preferences dialog
- Added file icons in tab (like gedit)
- Fix tab caption in tab-help after one level navigation
- Add Translation/Bug report buttons to help menu
- Add HTML files webkit preview
- Various improvements to build system
- RGBA colormap support
- Various plugin system upgrades
- Add check for externally modified files
- Remember incremental search strings
- Added CSS calltips support
- Speed up Calltip/autocomplete lists
- Auto-Completion of Brackets and Quotes
- Hightlight current caret line
- Misc bugfixes and code cleanups

Version 0.9.95 from debian repository

Merged modifications done for initial commit at Savannah