BioFormatsFormat: simplify double negative logic

Rather than saying "!dontConvert" we say simply "convert" for clarity.
BioFormatsFormat: remove EOL spaces
BioFormatsFormat: fix formatting of try/catches
BioFormatsFormat: remove extra spaces
BioFormatsFormat: fix javadoc formatting
BioFormatsFormat: remove empty javadoc blocks

The @author tag is rather redundant since the toplevel class is already
annotated the same. It can be assumed that the same author wrote the
nested classes, too.
BioFormatsFormat: add @Overrides

These methods are all implemented in the superclass,
so it should compile even with Java 5.