Bug fix for croplands/pastures (reproduction.f90)

[mpaiao]

It seems the reproduction code was not updated when pastures and croplands were split. This fix now allows for pastures PFTs to reproduce in dist_type = 1, and cropland PFTs to reproduce in dist_type = 8. I believe this addresses the fix on #334 (thanks @mccabete for spotting it).

Description

Collaborators

Motivation and Context

Types of changes

• [ x] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.

Testing :

• All new and existing tests passed.

[mccabete]

@mpaiao
Quick clarification: Does the most recent config.xml also have a <include_pft_pt> flag?

Because my latest config.xml doesn't, only

 <include_pft></include_pft>
  <include_pft_ag></include_pft_ag>
  <include_pft_fp></include_pft_fp>
  

Also, are all grass PFT's part of the pasture scheme by default, or is the pasture scheme a disturbance type, so it needs to be turned on via a disturbance flag?