ERT-565: Added new method util_sscanf_percent(...)
ERT-565: Added test for new method util_sscanf_percent(...)
ERT-565: Analysis-config: reading percent value if present for MIN_REALIZATIONS_KEY
ERT-565: Added test for percent support for MIN_REALIZATIONS
ERT-565: Removed unecessary check
ERT-565: Added IDE support for percent in MIN_REALIZATIONS key
ERT-565: Change after review: Check if util_sscanf_int succeeds
ERT-565: Change after review: Method util_sscanf_percent: Using strtod method for a better implementation of this method. Also removed /100 to users of the function. That is, scannong 10% returns number 10
ERT-565: Changes after review: Only accept percent tokens with no space between the number and the %
Merge pull request #482 from chflo/ERT_565_min_realisations_percent

Ert 565 min realisations percent
ERT-565: Added PercentArgument type as type for item type in the IDE.
ERT-565: Added PercentArgument as allowed type for the MIN_REALISATIONS keyword.
Merge pull request #486 from joakim-hove/ERT-565-add-percent-item

Ert 565 add percent item