Separate buffer handling for info and format access.

[johanneskoester]

Previously, we had one buffer for all. We discovered that this could lead to memory issues, and also race conditions in certain cases. Now, each call to info() and format() will allocate its own buffer. Alternatively it is possible to pass a shared buffer via info_shared_buffer() and format_shared_buffer().

[coveralls]

Pull Request Test Coverage Report for Build 372866036

• 68 of 82 (82.93%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 93.86%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/bcf/mod.rs	16	18	88.89%
src/bcf/record.rs	52	64	81.25%

Totals
Change from base Build 372795131:	-0.04%
Covered Lines:	10823
Relevant Lines:	11531

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💛 - Coveralls