tskit conversion

Recent changes and conda updates (#70)

* Change simulation to be more intuitive and always have the desired range of simulation

* Remove pdb statements

* Incredibly hacky version of masking

* Some simulation changes

* Some partial changes wrt output class

* Simple record instance to store trees before converting to tables

* First stab at functional tables, not much in terms of inferring them from the data

* Recursion to find paths

* Find MRC node

* Working tree updates, need to do some QC

* Remove internal nodes

* Test case working except for one edge

* Same MRC recomb and reciever causing havoc in node creation

* Producing sensible trees up to time

* move

* Simple addition to get migration segments

* Bump version to 1.0.2 and have working migration segment inference.

* Still working

* Conda changes for 1.0.2, and generalisation of simulation protocol.

* Get rid of pedantic warnings

* Fix RPATH during native cmake and amend local conda-build instructions with env file

* update changelog

* move things around a little

* Edit simulations and reporting of scrm approximation

* Flexible conda building, version bump, and small edits.

* Edit readme

* Edit installation

VCF Conversion

• Alternate build for python 3.8 (and on conda)
• Implement vcf_to_seg
• Documentation updates