this is a bit trickty, since we need to install gcc-4.9 from a PPA.
Mint only provides the libstdc++ 4.8, which is known to break when
compiling in C++14 mode
This means we have rather tight compiler requirements now.
Beyond that, we expect no serious impact; the most notable
C++14 feature we're likely to use soon is type inference
on lambda arguments.
Add a page to the 'coding howto' section, listing those boost libraries we're
using heavily, with a short characterisation for each. Plus some informations
about potential problems
