Doc strings

Closes #27 (closed)

Update documentation strings for modules and functions:

• mo_anneal
• mo_append
• mo_boxcox
• mo_cli
• mo_constants
• mo_corr
• mo_cost
• mo_dds
• mo_errormeasures
• mo_forces_info
• mo_julian
• mo_kind
• mo_likelihood
• mo_linfit
• mo_mad
• mo_mcmc
• mo_message
• mo_moment
• mo_ncread
• mo_ncwrite
• mo_netcdf
• mo_nml
• mo_opt_functions
• mo_optimization_types
• mo_optimization_utils
• mo_orderpack
• mo_os
• mo_percentile
• mo_poly
• mo_sce
• mo_spatialsimilarity
• mo_standard_score
• mo_string_utils
• mo_temporal_aggregation
• mo_timer
• mo_utils
• mo_xor4096