develop bed conversion

[alkaZeltser]

BED Conversion

This PR contains

• Functions for converting a PGS weight file to a BED file

• Functions for merging multiple BED files into one BED file, collapsing overlapping SNP coordinates

• Unit tests for both of the above

• Test data for the unit tests

• man pages documenting the above functions

• I have read the code review guidelines and the code review best practice on GitHub check-list.

• The name of the branch is meaningful and well formatted following the standards, using [AD_username (or 5 letters of AD if AD is too long)-[brief_description_of_branch].

• I have set up or verified the branch protection rule following the github standards before opening this pull request.

• I have added the changes included in this pull request to NEWS under the next release version or unreleased, and updated the date.

• I have updated the version number in metadata.yaml and DESCRIPTION.

• Both R CMD build and R CMD check run successfully.

Testing Results

All unit tests pass.

══ Results ═══════════════════════════════════════════════════════════════════════════════════════════════
Duration: 0.6 s

[ FAIL 0 | WARN 6 | SKIP 0 | PASS 72 ]

[forbiddenpersimmon]

Code itself looks good and unit tests were thorough. Just left some formatting fixes for you to do before merging.