Five Line Skink

This is a prerelease version of Five Line Skink. Major differences between Skink 2.0 and Skink 1.x include:

* Skink 2.0 supports multi-voice abc, as well as related features such as alto, tenor and bass clefs
* Skink 2.0 can invoke abcm2ps directly.
* Support for multiple open files in separate windows
* window menu
* support for abcm2ps format files
* preferences menu can be used to update abcm2ps path and format file
* sample format file (skink.fmt) to produce abcm2ps output similar to Skink output
* tested on Mac OSX 10.5.7 with Java 5, Windows XP with Java 6 and Ubuntu 9.04 with Sun Java 6

Some other enhancements include:

* improvements to layout
* more consistent handling of the interaction between continuous layout mode and playback - in continuous mode, Skink will now only display the tune in which data is being entered, and will play that tune when play is invoked from the menu
* the abc file directory is now 'sticky' - Skink will remember the last directory from which abc files were opened after restart.

Note that in this version there are a number of restrictions, some of which are documented here:

* Skink 2.0 requires Java 1.5 or better, and thus must run on Mac OS X 10.4.x or better
* In order for Skink to invoke abcm2ps, it must be installed separately, and must appear in the path. The pre-built abcm2ps that is available at http://abcplus.sourceforge.net/#abcm2ps installs in /usr/bin/ which satisfies these requirements. Future versions of Skink will support configuration of the location and options of abcm2ps. In the current version, this is controlled by the environment variable "ca.celticmusic.skink.abctool",which defaults to the string "abcm2ps". This can also be changed from the preferences menu.
* Merging voices on a single staff is not yet supported.
* Playback of multi-voice music is not fully supported. Specifically, in cases where one voice has tuplets (for example triplets) while another does not, roundoff error can cause the voices to become unsynchronized.
* The interaction between parts (P:xxx) and voices (V:xxx) is not fully resolved.
* Selecting 'New' from the file menu when you have changed a file will prompt you to save the file
* It is possible to open the same file multiple times. If you change the file in different buffers, the last one saved will win.
* When canceling out of quit, the Window menu can be momentarily corrupted.
* Multiple windows can cover each other.