Er update1

[gerardhros]

0.6.0

Changed

• B_LU_BRP is removed as input for all bbwp_x functions, issue Function bbwp() should only use B_LU_BRP or B_LU_BBWP and not both #35
• set default BRP codes per BBWP category for waterstress indicators in bbwp_field_properties
• B_LU_BBWPcategories have been updated from 1-9 to 1-12

Added

• table bbwp_measures is updated with scores, rewards and applicability of ER measures, issue update bbwp_measures internal package table #11
• accumulation requirements are added to er_meas_rank and er_meas_score, issue Add effect of accumulation requirements measures #13
• farm measure scoring is added to er_croprotation, issue link farm measures to BBWP and ER scores #12
• measures input table requires a bbwp_status to account for accumulation effects
• medalscore added as argument toer_farm_aim, overruling input of argument farmscore

[gerardhros]

update done for bbwpc 0.6.0.
sf import was failing in automatic tests on windows,
since this is not a required import (but suggested), i merged the branch.