Enhancements:
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* allow '*' as an ignore_run_exports value to ignore all run_exports  #2907

Bug fixes:
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* fix handling of empty run and test requirements  #2908
* fix trailing zeroes in version numbers getting lost by yaml interpreting things as floats  #2909
* fix regression in host prefix showing up in the test phase, leading to files/executables not being where they should be  #2910
* fix handling of not-yet-available requirements  #2912
* fix get_value with default keyword not respecting that user-specified default  #2912

Contributors:
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* @msarahan