add sourceme & README.TXT for Lmod

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add hint on Lmod & buildsets relation

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
prereqs pedantic comment

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
update bits for Lmod/5.4

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add export LMOD_MPATH_AVAIL=yes

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
rephrase a comment

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
promote lmod to v5.4.1

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
promote lmod to v5.4.2

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
Merge pull request #746 from fgeorgatos/contrib_Lmod_sourceme_n_readme

add sourceme & README.TXT for Lmod