Radium 6.9.89 released

[Kjetil Matheussen]

This release should be the last one before Radium V7.

The biggest news this time is that the macOS version has changed
status from stable to Beta. The full macOS version is available for
free from now on. The reason for this is that Radium for macOS has
many quirks that the Linux and Windows versions don't have.

In addition to that, this release contains a fix for crashing the
program when quantitizing notes. The bug was introduced in 6.9.80 so
all releases after 6.9.80 have been marked unstable.

Most work has been put into the manual this time. Not the content of
the manual, but on the technical side of it. Most notable new feature
is the extremely efficient search function:
https://users.notam02.no/~kjetism/radium/documentation/


Changes 6.9.88 -> 6.9.89:
* Editor: Fix crash when quantitizing notes. Bug
introduced in 6.9.80.
* Windows32: Fix import MOD.
* Macos: Open Help windows in an external browser
since the manual now uses javascript-features not
supported by QtWebkit 5.9.
* Manual: Include search field + various other
improvements.
* Faust: Fix possible performance problem for the
interpreter backend.
* API:
* gui_web: Handle local files with queries.
* gui_web: Only accept Escape key if currently
searching. (Previously it hindered all other
usage of the Escape key by web pages.)