Implemented DeleteRequest function
ADDED: Rows now named after original data index
ADDED: Row name support functions to set/get index data
CHANGED: sortrows() updated back to simply sorting the rows
CHANGED: If a delete fails, selection is reset
CHANGED: Table rebuild if data is deleted, to keep data/row indices in sync
ADDED: Delete Request button and hookups
Merge pull request #12 from Hiblet/DeleteRequest01

Implemented DeleteRequest function