fix wave panning if a non graph added, better error reporting in png writer function, better flags option names for special objejcts (image and graphs)

xschem_library/rom8k/rom8k.sch

@@ -47,8 +47,8 @@ y1 = -0.021
 y2 = 1.5
 subdivy=1
 divy = 4
-x1=1.41996e-07
-x2=2.02558e-07
+x1=1.58347e-07
+x2=2.18909e-07
 divx=10
 subdivx=4
 node="ldcp ldyms[4] ldyms[5] ldyms[6] ldymsref"
@@ -77,8 +77,8 @@ y2 = 1.6
 ypos1=0.0694741
 ypos2=2.61557
 divy = 1
-x1=1.39863e-07
-x2=2.00425e-07
+x1=2.07427e-07
+x2=2.67989e-07
 divx=12
 subdivx=4
 node="
@@ -104,8 +104,8 @@ B 2 1840 -1300 2890 -1160 {flags=graph_unlocked
 y1 = -0.022
 y2 = 1.6
 divy = 4
-x1=1.41996e-07
-x2=2.02558e-07
+x1=1.84671e-07
+x2=2.45233e-07
 divx=8
 unitx=n
 node="xsa[0].ldqib xsa[5].ldqib xsa[0].ldsali xctrl.ldq_b"