add validator checkbox_group, plus utility for numeric range #42
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checkbox_group
added validator to check a group of checkboxes, to ensure required number of checkboxes were checked, using range (1-2), min1, or max2, etc.
lang
added prefix & suffixes for checkbox_group
renamed prefixes & suffixes used for length validation
numericRangeCheck
added utility function to evaluate value against allowed parameter. abstracted internal check in validate_length to use this util function instead of repeating functionality
validate_length
edited function to use new utility function numericRangeCheck