Issue 06/fix linting (#7)

* wip: lint part I

* fix: added `\.vscode` to `.gitignore`

* wip: lint part II

* style: changed `while` to explicit `for`-loop as `len` is known at runtime

* idiom: went for more idiomatic/faster vector filling

* lint/idiom: rearranged index-based loops and vector filling; added `match` or `map...` instead of `if-else`

* lint: removed unnecessary parenthesis that caused compiler warning

* lint: lint part III

* refactor: refactored householder reflections to be more idiomatic and have the more likely branch in the `if` rather than the `else`

* lint: lint part IV

* lint: lint part V

* lint: lints for `data.rs`

* lint: slice lints part I

* lint: slice lints part II

* lint: slice lints part III

* refactor: changed `while`-loop to explicit `for`-loop

* lint: slice lints part IV

* lint: slice lints part V

* lint: slice lints part VI

* lint: LINTED DOCSTRINGS

* lint: linted basic and save-load tests

* lint: lint solver tests

* lint/idiom: made `for`-loop more idiomatic

* idiom: made `cumsum` more idiomatic by replacing loop with zipped iterator

* comment: added `FIXME`

* fix: fixed double-closing doctest

.gitignore

@@ -1,4 +1,5 @@
 /target
+/.vscode
 
 # Ignored file types
 *.lock