renamed file_line_number_idx to avoid name collision in sqlite
renamed file_line_number_idx to avoid name collision in sqlite

For some reason the file_line_number_idx already exists but changing
the name to file_line_num_idx works.

mikehelmick/CascadeLMS,mikehelmick/CascadeLMS,mikehelmick/CascadeLMS,mikehelmick/CascadeLMS