setORF: refSeq first, then transcript

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
setORF: optionally take translationStart

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Do not call setORF in replaceTranscripts.

Now each editing function must call setORF itself.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
addDraggedFeatures: call merge only if more than one transcript

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
mergeTranscripts: set correct ORF.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>