Rpath 1.1.0

• Added ability to import .eiixml files via the create.rpath.from.eiixml() function
• Added balance functionality to estimate P/B from input Biomass and EE, also
  allowing a missing Q/B to be estimated from input PC and the estimated P/B
• Corrected accounting for single-stage interdetrital flows during balance
• Behavior change: if all of P/B, Q/B, and PC are supplied as inputs for a group, recalculate PC during balance to ensure internal model consistency (instead of leaving PC unchanged and possibly inaccurate)
• Improved error messages in rpath() balance routine to help diagnose models that are missing parameters
• Improved warning message content in check.rpath.params() to aid diagnosis
• Modified rpath.stanzas() so it no longer produces errors when called with a model that has no multistanza groups (instead it returns the model unchanged)
• Added Western Bering Sea model .eiixml and EwE output csv files as an import example
• Added Convert_EwE_to_Rpath vignette to describe .eiixml import process
• Tested eiixml input routines on over 150 models available via EcoBase with most producing consistent results between Rpath and EwE; some remaining balancing differences between Rpath and EwE are noted in the Convert_EwE_to_Rpath vignette
• Fixed some table ordering issues with stanza inputs
• Documentation fixes