Fix buffer overflows

http://www.mothur.org/forum/viewtopic.php?f=4&t=591

--- Mothur.source/filterseqscommand.cpp
+++ Mothur.source/filterseqscommand.cpp
@@ -305,8 +305,8 @@
 					
 					//wait on chidren
 					for(int i = 1; i < processors; i++) { 
-						char buf[4];
-						MPI_Recv(buf, 4, MPI_CHAR, i, tag, MPI_COMM_WORLD, &status); 
+						char buf[5];
+						MPI_Recv(buf, 5, MPI_CHAR, i, tag, MPI_COMM_WORLD, &status); 
 					}
 					
 				}else { //you are a child process
@@ -326,11 +326,11 @@
 					
 					if (m->control_pressed) {  MPI_File_close(&inMPI);  MPI_File_close(&outMPI);  return 0;  }
 					
-					char buf[4];
+					char buf[5];
 					strcpy(buf, "done"); 
 					
 					//tell parent you are done.
-					MPI_Send(buf, 4, MPI_CHAR, 0, tag, MPI_COMM_WORLD);
+					MPI_Send(buf, 5, MPI_CHAR, 0, tag, MPI_COMM_WORLD);
 				}
 				
 				MPI_File_close(&outMPI);
--- Mothur.source/distancecommand.cpp
+++ Mothur.source/distancecommand.cpp
@@ -271,8 +271,8 @@
 				for(int i = 1; i < processors; i++) { 
 					if (m->control_pressed) { MPI_File_close(&outMPI);  delete distCalculator;  return 0; }
 					
-					char buf[4];
-					MPI_Recv(buf, 4, MPI_CHAR, i, tag, MPI_COMM_WORLD, &status); 
+					char buf[5];
+					MPI_Recv(buf, 5, MPI_CHAR, i, tag, MPI_COMM_WORLD, &status); 
 				}
 			}else { //you are a child process
 				//do your part
@@ -280,10 +280,10 @@
 				
 				if (m->control_pressed) { MPI_File_close(&outMPI);  delete distCalculator;  return 0; }
 			
-				char buf[4];
+				char buf[5];
 				strcpy(buf, "done"); 
 				//tell parent you are done.
-				MPI_Send(buf, 4, MPI_CHAR, 0, tag, MPI_COMM_WORLD);
+				MPI_Send(buf, 5, MPI_CHAR, 0, tag, MPI_COMM_WORLD);
 			}
 			
 			MPI_File_close(&outMPI);
--- Mothur.source/chimeracheckcommand.cpp
+++ Mothur.source/chimeracheckcommand.cpp
@@ -269,8 +269,8 @@
 					
 					//wait on chidren
 					for(int j = 1; j < processors; j++) { 
-						char buf[4];
-						MPI_Recv(buf, 4, MPI_CHAR, j, tag, MPI_COMM_WORLD, &status); 
+						char buf[5];
+						MPI_Recv(buf, 5, MPI_CHAR, j, tag, MPI_COMM_WORLD, &status); 
 					}
 				}else{ //you are a child process
 					MPI_Recv(&numSeqs, 1, MPI_INT, 0, tag, MPI_COMM_WORLD, &status);
@@ -288,9 +288,9 @@
 					if (m->control_pressed) {  MPI_File_close(&inMPI);  MPI_File_close(&outMPI);   for (int j = 0; j < outputNames.size(); j++) {	remove(outputNames[j].c_str());	}  delete chimera; return 0;  }
 					
 					//tell parent you are done.
-					char buf[4];
+					char buf[5];
 					strcpy(buf, "done"); 
-					MPI_Send(buf, 4, MPI_CHAR, 0, tag, MPI_COMM_WORLD);
+					MPI_Send(buf, 5, MPI_CHAR, 0, tag, MPI_COMM_WORLD);
 				}
 				
 				//close files