Bump required YCM version (v0.10+)

[PeterBowman]

We are about to increase the required version of YCM as a hard dependency in several repos. On the next few days, YCM v0.10 or later will be requested by root CMakeLists.txt following the progress of #78 and #79. We acknowledge that a bug spoils superbuilds (<robot>-main repositories) if YCM is pulled from the web; a fix is expected and coming to v0.10.1, soon (robotology/community#338 (comment)).

[traversaro]

You may be interested in this regression as well: robotology/robotology-superbuild#191 .

[PeterBowman]

@traversaro thanks!

[PeterBowman]

cc @roboticslab-uc3m

YCM 0.10 or later is now enforced in several projects, specific requirements are detailed in the installation instructions at doc/<project>-install.md.

We acknowledge that a bug spoils superbuilds (<robot>-main repositories) if YCM is pulled from the web; a fix is expected and coming to v0.10.1,

More issues arose in YCM v0.10.1, those are fixed in YCM master branch and a v0.10.2 release is expected, soon. If you are using a <robot>-main repository, make sure YCM performs the update-self step (alternatively, delete the external/YCM/ directory).

[PeterBowman]

YCM 0.10.2 has been released today with several bugfixes, it is recommended to upgrade from 0.10.0 or 0.10.1.