Cosmetic changes in texinfo headers. Deleted trailing white spaces. Changed the value of show_time in the third internal test.

./tests/ep/linear.mod

when necessary

doesn't work yet; now Jacobian is singular

allow the possibility to close all slaves from a condition found in one single thread (e.g. in a while loop where all threads look for the verification of a condition in a loop)

manually cherry picked from 4.2. branch:
1a5a294c

specially useful when neighborhood_width is used

Added calls to matlab implementation of the perfect foresight solver in homotopic routine (extended path approach).