CLN: core/format: replace bare exceptions
CLN: change wording of multi_index -> MultiIndex for consistency
TST: Test changed Exception in core/format
CLN: core/frame: replace bare exceptions
CLN: core/internals: replace bare exceptions
CLN: core/index: remove bare exceptions
CLN: core/panel: replace bare exceptions
CLN: core/series: replace bare exceptions.
CLN: core/panelnd: remove bare exceptions
CLN: rpy/common: replace bare exceptions
CLN: io/excel: replace bare exceptions
CLN: core/common: replace bare exceptions
TST: core/common: add tests for _mut_exclusive NOT DONE
core/common - change exception, leave note