Regression full methylation only output option

[liamgd]

The regression_full algorithm should include an option to omit all regression results besides methylation in the output. With this option enabled, the output does not include regression results for the intercept or covariates. However, they will still be included in the computation.

Similar to regression_single, this option will be enabled by default, meaning only methylation regression results will be outputted by default.

[liamgd]

Tested with 300 samples, 1,000 methylation loci, and 1,000 gene expression loci.

Passed all tests (32 commands, combinations of chunking, region filtration, p-value filtration, and methylation_only) with no errors.

Tests ran

``` tecpg run mlr-full tecpg run mlr-full --cis tecpg run mlr-full --distal tecpg run mlr-full --trans tecpg run mlr-full -p 0.05 tecpg run mlr-full -p 0.05 --cis tecpg run mlr-full -p 0.05 --distal tecpg run mlr-full -p 0.05 --trans tecpg run mlr-full -l 2000 tecpg run mlr-full -l 2000 --cis tecpg run mlr-full -l 2000 --distal tecpg run mlr-full -l 2000 --trans tecpg run mlr-full -l 2000 -p 0.05 tecpg run mlr-full -l 2000 -p 0.05 --cis tecpg run mlr-full -l 2000 -p 0.05 --distal tecpg run mlr-full -l 2000 -p 0.05 --trans tecpg run mlr-full -f tecpg run mlr-full -f --cis tecpg run mlr-full -f --distal tecpg run mlr-full -f --trans tecpg run mlr-full -f -p 0.05 tecpg run mlr-full -f -p 0.05 --cis tecpg run mlr-full -f -p 0.05 --distal tecpg run mlr-full -f -p 0.05 --trans tecpg run mlr-full -f -l 2000 tecpg run mlr-full -f -l 2000 --cis tecpg run mlr-full -f -l 2000 --distal tecpg run mlr-full -f -l 2000 --trans tecpg run mlr-full -f -l 2000 -p 0.05 tecpg run mlr-full -f -l 2000 -p 0.05 --cis tecpg run mlr-full -f -l 2000 -p 0.05 --distal tecpg run mlr-full -f -l 2000 -p 0.05 --trans ```

[liamgd]

Implemented in 23ce333.