Cleanup: move code-ref into plain sub.
Refactor inventory import routine. Now supports absolute and delta uploads.
Merge pull request #57 from einhverfr/1.4

Fixing errors with reports and blank dates
Implement multi-date file imports.
Set required precision field in the generated invoice.
Merge pull request #58 from ledgersmb/1.4

Merge 1.4 to feature branch.
Factor query into prepared parameterized statement and better input check.
Merge upstream changes.
Make routines internal to fix doc tests.
Merge pull request #68 from ledgersmb/1.4

sync over 1.4 branch
Try building with multiple database versions.
Try building with multiple database versions.
End of experimentation with multiple databases.
Remove quoting now that the arguments are passed as parameters.
Merge pull request #77 from ledgersmb/1.4

sync over 1.4 branch
Merge pull request #325 from ehuelsmann/feature/1.4-upload-multidate-inventory

Feature/1.4 upload multidate inventory