doc: fixing GPUWORKLOAD formula and few other small fixes

Manual/BioEM_Manual.tex

@@ -15,7 +15,6 @@
 \usepackage{graphicx}
 \usepackage{amsfonts}
 \usepackage{latexsym}
-\usepackage[dvips]{color}
 \usepackage{layout}
 \usepackage{setspace}
 
@@ -1396,7 +1395,7 @@ A starting point is to measure the CPU and GPU individually with
 \texttt{BIOEM\_DEBUG\_OUTPUT=2; BIOEM\_DEBUG\_BREAK=4; GPU=0/1}
 
 and compare the time of CPU to that of the GPU. Assuming that the CPU takes \texttt{c} seconds for the comparison, and the
-GPU takes \texttt{g} second, a good starting point for \texttt{GPUWORKLOAD=[x]} is \texttt{x = 100 * g / (c + g)}.
+GPU takes \texttt{g} second, a good starting point for \texttt{GPUWORKLOAD=[x]} is \texttt{x = 100 * c / (c + g)}.
 
 \item On a single node, one should use OpenMP parallelization for many particle-images and few orientations; and MPI
 parallelization for few particle-images and many orientations. Assume a system with \texttt{N} CPU cores, the command 

Manual/bib_manual.bib

@@ -1328,7 +1328,7 @@ Unique-ID = {{ISI:000185731300001}},
 @article{BioEM_server,
 title = "BioEM: GPU-accelerated computing of Bayesian inference of electron microscopy images",
 journal = "Comput. Phys. Commun.",
-author = "Cossio, Pilar and Rohr, David and Baruffa, Fabio, and Rampp, Markus and Lindenstruth, Volker and Hummer, Gerhard",
+author = "Cossio, Pilar and Rohr, David and Baruffa, Fabio and Rampp, Markus and Lindenstruth, Volker and Hummer, Gerhard",
 year = "2016"
 }