fix almost filled with water to 1.0-1e-6

[totto82]

This is the third part of #803

[totto82]

jenkins build this please

[hnil]

Probably put it in the tag system to be changed. Maybe we should add a type DefaultTolerances where one could get forexample (if it do not exist):

using NumTol = GetPropertyType<TypeTag, DefaultTolerances>;
static constexpr myeps = NumTol::eps;

Reasons:

• be able to change them
• avoid putting it as hidden defaut input
• collect numbers used for numerical hacks ++ one place
• avoid all the boiler plate assosiated with input parameter i.e. tag definitions, init, register.

[totto82]

benchmark please

[totto82]

Probably put it in the tag system to be changed.

Good point. Especially since it seem to affect lot of cases.

[totto82]

benchmark please

[totto82]

Added it to as a parameter here. #816

Will close this for now.