Created README, basic build information.

Modified src/api functions to build without warnings, mostly unused
	variables that were declared.
Changed un/packstr into separate unpackstr_ptr and unpackstr_xmalloc,
	the first returns a pointer into the buffer, the second allocates
	memory and copies the string into it. Updated src/test/pack-test.c
	accordingly.
Converted integers in various job/node/partition structures into
	uint32_t for ease of passing across network with API.

src/test/pack-test.c

@@ -12,6 +12,7 @@
 #include <string.h>
 
 #include <src/common/pack.h>
+#include <src/common/xmalloc.h>
 
 int main (int argc, char *argv[])
 {
@@ -23,20 +24,23 @@ int main (int argc, char *argv[])
         int len_buf = 0;
         uint16_t test16 = 1234, out16;
         uint32_t test32 = 5678, out32, byte_cnt;
-        char testbytes[] = "TEST STRING", *outbytes;
+        char testbytes[] = "TEST BYTES", *outbytes;
+	char teststring[] = "TEST STRING",  *outstring = NULL;
 
         bufp = buffer;
         len_buf = sizeof(buffer);
         pack16(test16, &bufp, &len_buf);
         pack32(test32, &bufp, &len_buf);
         packstr(testbytes, (uint32_t)(strlen(testbytes)+1), &bufp, &len_buf);
+        packstr(teststring, (uint32_t)(strlen(teststring)+1), &bufp, &len_buf);
         printf("wrote %d bytes\n", len_buf);
 
         bufp = buffer;
         len_buf = sizeof(buffer);
         unpack16(&out16, &bufp, &len_buf);
         unpack32(&out32, &bufp, &len_buf);
-        unpackstr(&outbytes, &byte_cnt, &bufp, &len_buf);
+        unpackstr_ptr(&outbytes, &byte_cnt, &bufp, &len_buf);
+        unpackstr_xmalloc(&outstring, &byte_cnt, &bufp, &len_buf);
 
         if (out16 != test16) {
                 printf("un/pack16 failed\n");
@@ -50,10 +54,17 @@ int main (int argc, char *argv[])
 		passed++;
 
         if (strcmp(testbytes, outbytes) != 0) {
-                printf("un/packstr failed\n");
+                printf("un/packstr_ptr failed\n");
 	} else
 		passed++;
 
+        if (strcmp(teststring, outstring) != 0) {
+                printf("un/packstr_xmalloc failed\n");
+	} else {
+		passed++;
+		xfree(outstring);
+	}
+
         printf("%d tests passed, %d failed.\n", passed, failed);
 
 	return failed;