CheckSezpoz: do not run on non-existent directories

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
CheckSezpoz: use correct source path for test classes

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
CheckSezpoz: actually use the -proc:none flag

This change makes sure that debugging information provided by the
original compile run is not taken away when running SezPoz by telling
the Java compiler to run *only* the Sezpoz annotation processor
(the options were actually added to a list of Strings, but then the
original argument array was used instead).

Noticed by Mark Hiner.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
CheckSezpoz: fix fall-back to 'apt'

Those pesky varargs... ;-)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'sezpoz-checker-fixes'

Assorted fixes in the CheckSezpoz class (that is supposed to help
developers stuck with Eclipse -- because Eclipse does not conform
to the mandated standard that compiling Java classes must run
the annotation processors in the class path).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>