The ODK should take care of generating documentation for DOSDP patterns

[gouttegd]

The CL custom Makefile includes a rule to generate some documentation pages from the DOSDP patterns:

pattern_docs:
	dosdp document -i ../patterns/dosdp-patterns/ -o ../../docs/patterns/ -d ../patterns/data/matches/

Given that the standard ODK Makefile already contains rule for about every task related to patterns (validation, query, generation), it should also include a rule for generating their documentation, without asking users to create their own rule like CL does above.