This reverts commit f2a6344b.

Tested that it works for the 1st bank in TOF and dSpacing and for focussed data 
for all 3 banks in dspacing. 

Taken out temporary TOF-dSpacing constants once put in as a temporary measure 
while code for param units was developed. 

re #2578

Lower-case first letter of instruments and scripts directories. All our installers did this anyway and this will mean less manipulation of the properties file is needed. Re #2753.