Standardize macros for verb and motion derivation citations

[jcrippen]

Currently citations of verbs – e.g. awsiteen (∅; achievement) ‘s/he/it saw him/her/it’ – and citations of motion derivations – e.g. NP-dáx̱ (g; kei=…-ch repetitive) ‘up from NP’ – are variously coded in the LaTeX source. They should all be unified using the same macros everywhere. Some can found by regular expression, but the multiple inconsistent patterns currently used for them mean that some will have to be identified by eye.