Add commands in myantcompile.el (Emacs) to compile current java
file with "javac", and to run it with "java" (with key bindings).
Added a command in myantcompile.el (Emacs) to add current file
package FQN at point (java), to use for example when adding imports
in class preamble, without having to type whole package paths by hand.
Updates Emacs abbrevs.