Only change multiline comments of the form
```rust
/*
* Text
*/
```
while not affecting comments of the form
```rust
/*
Text
*/
```
when normalize_comments is off. In the first case,
we have a known character we can align against, while
we don't have one in the second case.
Before, we have converted the second form into the first,
but this is against the spirit of normalize_comments being
turned off.
Fixes#956
* Split impl at 'for' if a line break is needed
* Fix formatting
* Improve comments
* Skip second try if there is no 'for'
* Restore intentional trailing whitespace
* Change test source to be incorrectly formatted
* Restore more missing trailing whitespace
* Remove too much whitespace...
Really should learn how to use git revert.
* Change required to prevent a trailing space at the end of a separate module being propagated
* Detect the start of the output file rather than the start of the input file when deciding whether to output preceding snippets - this stops unnecessary whitespace and blank lines from being inserted when spans and statements are output in an order other than that from the input file.
* Add code to prevent space from being added with the prefix snippet if a) the snippet is entirely horizontal whitespace, or b) the snippet contains whitespace followed by a newline. This prevents trailing spaces at the end of a line from being added.
* Tests for this issue
* Tidy up `match` statements
* Add test with blank lines between `use` statements
* Fix issue-1049
* Add testcase suggested by pepyakin
* Fix last commit
* Handle special case
* Remove debugging println
* Fix grammar in comment
* Change word in comment
* Add test for long func without ret type
* Add one more test
* Add multiple configuration file names feature
* Add '.rustfmt.toml' in README file
* Clean up configuration file code
* Make config file names constant
* Use only one blank line
* Add config options for combinations of lines and items
* Reordering of import lines implemented.
* Changed nested matches to tuple pattern matching
* Added ordering of path list items to the ordering of use declarations
* Move `format_imports` and `format_import` methods to `imports.rs`
* Add comment to explain how `use` declarations are split off while walking through a module
* Change `ImportReordering` config option to separate boolean options
* Canonicalize file paths within the map of file line ranges
* Forgot to run the tests - and of course, the formatting of the canonicalization change was off, but it's fixed now!
* Move imports to the top of the file, as per @nrc.
* Change `canonicalize_path_string` to return `Option<String>`, `None` indicating an error rather than an empty string
* `format!` is better than string concatenation...
* Change `canonicalize_path_string` to return `Result` rather than `Option`
