All versions of Series/Parallel Resistor

Added 5th column, named Delta(R1, R2). For mobile phones it will be visible when holding the phone horizontically (landscape mode). For tablets it is always visible. Delta(R1, R2) is the absolute value of R1 - R2. In mathematical terms it is abs(R1 - R2). Users may need it it when searching e.g. for 2 parallel or serial sense resistors which values are as close as possible to each other in order to keep power dissipation in both resistors (almost) equally distributed.