Fix larval hypodermal muscles #1937
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Amend the definitions of 'embryonic hypodermal muscle' and 'embryonic/larval hypodermal muscle' to make it clear that those terms refer to muscles that have at least one of their ends attached to the hypodermis (body wall), as opposed to muscles that connect other internal body parts together without connecting them to the body wall.
All somatic muscles of the head are currently classified as hypodermal. This is incorrect as not all head muscles are connected to the hypodermis. We re-classify the following muscles: * 'larval cardiac outflow muscle': it connects the esophagus to the aorta and is therefore not connected to the hypodermis -> we re-classify it as a 'larval somatic muscle' and explicitly make it 'part of' some 'larval head'. * 'pharyngeal muscle': not all pharyngeal muscles are hypodermal, so likewise, we re-classify that term as a 'larval somatic muscle' and explicitly make it 'part of' some 'larval head'. That last change means that children of 'pharyngeal muscle' are no longer considered hypodermal, so for those children that are actually hypodermal, we need to explicitly re-assert them as 'embryonic/larval hypodermal muscle': * 'ventral pharyngeal muscle', * 'ventral mouthpart muscle 1', * 'dorsal protractor muscle'.
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This PR clears the confusion surrounding the larval “hypodermal (or body wall) muscles“.
It amends the definitions of 'embryonic hypodermal muscle' and 'embryonic/larval hypodermal muscle' to clarify that those terms refer to muscles that have at least one of their ends attached to the hypodermic (body wall), as opposed to muscles that connect other internal body parts together without connecting them to the body wall.
For most larval somatic muscles, in particular all the muscles from the thoracic and abdominal segments, this does not change anything as they are all connected to the hypodermis.
However not all somatic muscles of the head (which are currently all classified under 'hypodermal muscle of the head') are in fact hypodermal, so we re-classify the following muscles:
But some children of 'pharyngeal muscle' are in fact hypodermal, so for those, we need to explicitly re-assert them as 'embryonic/larval hypodermal muscle':
closes #1088