Fixed a bug where variables in sup/sub for integration did not convert to R0,R1,R2, etc.
Fixed a bug where variables in sup/sub for integration did not convert to R0,R1,R2, etc.

MathGen/oppgavegenerator,MathGen/oppgavegenerator,w0pke/oppgavegenerator,MathGen/oppgavegenerator,w0pke/oppgavegenerator,w0pke/oppgavegenerator