Add all the necessary options and default values to make quantification at 7T possible:

• Set default T1blood for 7T, and also for 1.5T based on field strength (previously it was only for 3T at default). 👍
• Calculate T1blood based on Hct using B0 - previously default 3T was used for all. 👍
• Create warnings when non-3T scanner is used and we don't have the non-3T defaults in the code - can create a lot of warnings, but it would have been wrong to use 3T without a warning. We might only check that some fields can be unused - so no need to warn on them. 👍
• Tissue T1GM of 1240 has a wrong reference in DataParTemplate.md and is possibly incorrect for 1.5T, though this default is not used in the code - has to be updated for other B0 as well.

Release notes

Added default T1-time values for different field- strengths.