enable/disable edit menu item based on whether an edit action is possible or not

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
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Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
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Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
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Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
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Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
merge exons if one is resized beyong the next one

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
split merge_exon and merge_transcript from merge_features

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
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Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Merge remote-tracking branch 'upstream/master'