Add modification caching; Constant terminal mods for ProForma #148
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Modification caching
All ModificationResolver types now use an in-memory cache for resolved modification definitions, reducing overhead of resolving the same rule over and over again.
Sub-classes should move their implementation of
resolve
to the_resolve_impl
method, otherwise the cache will not be used.To disable the cache for a resolver instance, call
resolver.enable_caching(False)
.Constant terminal modifications
This implements support for the syntax discussed in HUPO-PSI/ProForma#6 to include constant modification rules that apply to specific sequence terminals with or without specific amino acids.