Changes in 0.3.6 compared to 0.3.4

This version contains mainly documentation improvements at the user level and code maintenance improvements at the developer level.

Improved wording in docs.
Added explanatory diagrams in vignette and readme, updated existing ones.
Switched from large single vignette to multiple smaller ones. Currently 2 vignettes available: (1) Intro/Quick-start and (2) Tutorial.
R version in $Parameters will be recorded more compactly: only R.Version()["platform"] and R.Version()["version.string"] will be recorded, instead of the full output of R.Version() which contains a lot of redundancy.
The bootnum parameter is checked more extensively for sensible values. Warnings will be shown to raise awareness of potentially unjustified choices. Execution will not be halted except for serious mismatch between request and data.
In connection with the above, default bootnum changed from 100 to 0, to force users to consciously choose an appropriate value.
Some additional unit-tests.
Fixed printout issue of a missing newline between the progress bar and the following status message.

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