Issue #13: Creating 'Preparation method' field in Manage Samples

[nathanbollig]

This branch contains Hannah's work for Issue #13. Creating pull request from her latest commit.

[nathanbollig]

Reviewed and all looks good except for a few minor things:

• The label for the new field should be in sentence case like the other labels, i.e. Preparation method (currently reads Preparation Method).
• Please document the SQL command you ran to update the sample table in the existing database. This would help collaborators update their local database without rerunning the table creation script. (Was it something like this below?)

  ALTER TABLE sample
  ADD `preparation_method` varchar(45) DEFAULT NULL;

[hged13]

The SQL command used to update the database was:

ALTER TABLE sample ADD preparation_method varchar(45) DEFAULT NULL AFTER tissue_matrix;