updated wig2bed wrapper scripts to support --keep-header option
Merge branch 'v2p4p0' of https://github.com/bedops/bedops into v2p4p0
updated BEDOPS revision history to reflect changes to wig2bed
added improved documentation and fixes for bam2* and sam2* conversion scripts
updated gff2bed documentation and assets
updated vcf2bed documentation with --keep-header example
updated psl2bed documentation with --keep-header example
updated wig2bed documentation with --keep-header and --multisplit example
updated wig2bed documentation with --keep-header and --multisplit example
updated conversion index doc
updated conversion index doc
removed obsolete note from sort-bed doc