Remove dynamic exception specification (closes #689)

[eddelbuettel]

Two commits in here:

• the first is narrow and just removes the dynamic exception mechanism as discussed in #689
• the second looks invasive but just removes a bunch of spaces.

[codecov-io]

Codecov Report

Merging #690 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #690   +/-   ##
=======================================
  Coverage   89.77%   89.77%           
=======================================
  Files          66       66           
  Lines        3511     3511           
=======================================
  Hits         3152     3152           
  Misses        359      359

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[eddelbuettel]

Anyone? Shall I just squash it in?