Add ALMOST_EQ assertion

[srz-zumix]

#242

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@9290eab). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             develop     #245   +/-   ##
==========================================
  Coverage           ?   96.12%           
==========================================
  Files              ?      208           
  Lines              ?    10477           
  Branches           ?        0           
==========================================
  Hits               ?    10071           
  Misses             ?      406           
  Partials           ?        0

Impacted Files	Coverage Δ
include/iutest.hpp	100% <ø> (ø)
include/iutest_defs.hpp	96.87% <ø> (ø)
include/iutest_typed_tests.hpp	88.6% <ø> (ø)
include/tr1/iutest_value_tmp_tests.hpp	90.47% <ø> (ø)
include/iutest_util.hpp	100% <ø> (ø)
test/syntax_tests.cpp	96.1% <100%> (ø)
test/almost_eq_tests.cpp	100% <100%> (ø)
test/syntax_gtest_tests.cpp	95.89% <100%> (ø)
include/iutest_assertion.hpp	98.48% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9290eab...0c780b3. Read the comment docs.