Some updates to the docs

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge branch 'master' of https://github.com/coolprop/coolprop
Added a bunch of mixture derivative tests (all passing).

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Removed debugging commands

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added methanol viscosity correlation to close https://github.com/CoolProp/CoolProp/issues/82

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Updated ancillaries for R245fa

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Tidy derivatives

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Add note for methanol

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Update TTD.txt
Merge remote-tracking branch 'upstream/master' into python_plots

Staying tuned to Ian modifications
Limits correction back in place with KSI unit system