Initial version of Frequency Spectrum DDG goodie.
Updating code URL.
Improve handling of fractional frequencies
Improve handling of fractional frequencies
Replace magic numbers with constants, disallow consecutive dots in queries, and give radio spectrum examples.
Merge remote-tracking branch 'upstream/master'
Optimize variables and subroutines by tweaking their declarations.
Merge remote-tracking branch 'upstream/master'

Merge latest dev branch containing optimizations of variable declarations.
Adding function comments.
Merge pull request #252 from hollingsworthd/master

Frequency Spectrum
WorkdaysBetween: Create first version
WorkdayBetween: Allow end date first
WorkdaysBetween: Use Date::Calc::Objects for dates
WorkdaysBetween: Add more detail to description
WorkdaysBetween: Use default zci is_cached

zci is_cached => 1 is now the default, so there is no reason to specify
it explicitly.
WeekdaysBetween: Don't use integer pragma

Instead of using the integer pragma for the whole file, simply cast the
$num_weeks calculation to an integer before assignment.
WorkdaysBetween: Match on "business days between"
WorkdaysBetween: Parse dates in another subroutine
WorkdaysBetween: Allow DD/MM/YYYY date format
WorkdaysBetween: Add ridiculous date format tests