LIMS-1435: Put CCP4 location into config variable

[ndg63276]

JIRA ticket: LIMS-1435

Summary:

CCP4 has been updated, so the old path no longer works, meaning dimple maps show no electron density. The path shouldn't be hard-coded though.

Changes:

• Add $ccp4_location config variable
• Pass that variable into the mtz2map.sh script

To test:

• Add the config variable with $ccp4_location = '/dls_sw/apps/ccp4/latest/ccp4-9';
• Open a data collection with a dimple result, eg /dc/visit/nt37104-106/id/14642946
• Click on the Downstream Processing bar to show the dimple results, then click "Map / Model Viewer"
• Check the electron density is shown in blue in the centre of the image
• Check you can move/rotate the image