Skip and report files that fail to load as welly objects

[EvanBianco]

In the welly.Project.from_las('folder_of_LAS_files), it would nice to have a better handling of wells that fail to load. In particular, print the file name that fails but then keep on going loading the rest.

In an instance where I tried to load 2173 LAS from a single directory, it was a bit tricky to figure out which one was breaking the iteration through all the files.