Resource allocation tweaks

[yashpatel6]

          Looks good to me, although there are some tweaks I think could be made to improve resource usage.

• The GATK tools are generally single processor. I'm pretty sure the cpus for all of them here can be set to min and max of 1. call-sSNV Mutect2 uses 1 for all partitions (even M64) and has been fine as far as I know. This will make the biggest impact for HaplotypeCaller which runs for ~45 minutes x 50 scatters and is currently set at 3 (I should have caught this earlier). Some of the others are set at 10 cpus but only run for a minute or so.
• The memory allocations in the first line below (same for all partitions) could be reduced for the first try. Again the ones that run for only a couple minutes don't matter but two of them run typically for ~ 20m and 40m.

measure	run_MergeVcfs_Picard_VCF	run_MergeVcfs_Picard_GVCF	run_VariantRecalibratorSNP_GATK	run_VariantRecalibratorINDEL_GATK	run_ApplyVQSR_GATK_SNP	run_ApplyVQSR_GATK_INDEL
current mem	15	15	10	10	10	10
PCAWG min mem	5	5.3	2.2	1.2	0.6	0.5
PCAWG max mem	5.1	5.5	3.2	1.8	1.2	1.1
runtime	2m	40m	23m	1m	2m	1m

• This new method of viewing resource allocations really helps with this! I created a tsv for call-gSNPs current settings,

Originally posted by @sorelfitzgibbon in #189 (review)