Add support for schedule grid files

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 
 ## 7.9.4 (git master)
+* Add support for reading Sage 100 Contractor schedule grid files.
 * Ensure attribute names are valid when exporting JSON.
 * Improve handling of custom field lookup values (Based on a contribution by Nick Darlington).
 * Fix an issue when copying a calendar which has exceptions defined.

docs/apidocs/allclasses-frame.html

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docs/apidocs/allclasses-noframe.html

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